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Bleeding sprinkler head

Hi i noticed yesterday that when i shut off the sprinkler system one of my heads would still keep leaking so today i replaced it with a brand new one, but still have the same problem, thought it might be the valve so went out and bought a new rainbird valve but still leaking any ideas it's driving me mad lol thanks james

How long does it drain out? 15 Min? an hour? does it always drain out 24/7?

If it's only draining out 15min or so

Sprinkler systems are a gravity based system.. It's the lowest head at the end of the line and it is draining.. It will continue to drain until the zone has reached atmospheric pressure.

You can install a SAM Sprinkler head .. SPRAY , ROTOR ... To help prevent this from draining .. About 8' head it has ability to stop water draining.. The downfall is the next head in line will drain until it reaches atmospheric pressure.